You shouldn't need a humidifier unless your house is unusually dry. Get a digital outdoor thermometer and measure your temps and humidity. You can get them pretty cheap at Walmart, Target, and Home Depot.
Cause when push comes to shove you taste what you're made of
You might bend, till you break cause its all you can take
On your knees you look up decide you've had enough
You get mad you get strong wipe your hands shake it off
Then you Stand
I noticed that you've started asking a lot of basic corn snake care questions ... instead of beating up the boards with the potentially hundreds of questions that you could ask about corn snake care, it's probably a better idea to find some corn snake care sheets first. You can read them over and get the basics down and then if you have any questions ask away. There are lots of people here willing to help, but you really need to put forth at least a little effort.
I did a quick google search for "corn snake care sheet" and found tons of links. I think that would be a great start for you with your new animal!!
-adam
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"The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing."
- Anna Sewell, author of Black Beauty